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【单选题】
两块平板玻璃构成空气劈形膜,左边为棱边,用单色平行光垂直入射。若两平板玻璃的夹角稍稍增加,可观测到干涉条纹的 [ ]A.
间隔变小，并边方向平移
B.
间隔变大，并向远离棱边方向平移
C.
间隔不变，边方向平移
D.
间隔变小，并向远离棱边方向平移
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